Entomobrya elizeuli, Viana & Morais & Cipola, 2024

Viana, Stéphanie Dos Santos, Morais, José Wellington De & Cipola, Nikolas Gioia, 2024, Taxonomic revision of Entomobrya Rondani, 1861 (Collembola: Entomobryidae: Entomobryinae) from the Brazilian Amazon, Zootaxa 5452 (1), pp. 1-110 : 75-81

Entomobrya elizeuli sp. nov. Viana & Cipola

Figs 54–59, 72, Table 2

Type Material. Holotype female on slide ( INPA-CLL 0000331 ): Brazil, Rondônia state, Cacaulândia municipality, trail of “Jamari” waterfall, 10°13’26.8”S, 63°13’49”W ( Fig. 72), 120 m, 10.ii.–20.v.2012, malaise-trap, S Nihei & eq coll. Five paratypes on slides: 3 females ( INPA-CLL 0000332–34 ), plus 2 females on slides ( CC / UFRN and MZUSP), same date as holotype.

Diagnosis. Ant I–Th II depigment; Th III–Abd III with a heavily pigmented transversal band; coxa III and trochanter III strongly pigmented; collophore and Abd IV–Abd VI always depigmented ( Figs 54A–B),Ant IV without the apical bulb; pl1–2 smooth and bifurcated ( Fig. 55B); interocular p chaeta as mac; dorsal head macrochaetotaxy with 9–11 ‘ An ’, 3 ‘ A ’, 4–5 ‘ M ’, 9 ‘ S ’, 1–2 ‘ Ps ’, 4 ‘ Pa ’, 2 ‘ Pi ’, 2 ‘ Pm ’, 1–2 ‘ Pmp ’, 5 ‘ Pp1 ’, 1 ‘ Ppe ’ and 5 ‘ Pe ’ mac, respectively ( Fig. 55C); labral inner papillae with 3–4 projections, outer with 2 projections ( Fig. 56A); labial papilla E l.p. conical and not reaching the base of a.a. ( Fig. 56B); Th II internally with 8 anterior, 5–6 median and 18–20 posterior mac; Th III–Abd I with 21–25 and 8–11 mac, respectively; Abd II–III with 4–5 and 0 inner mac, respectively; Abd IV with 21–23 inner and 17–22 outer mac ( Figs 57A–C); unguiculus III ai lamella acuminate and pe partially serrated, with 3 proximal teeth ( Fig. 58E); collophore anteriorly generally with 4 distal mac ( Fig. 59A); dens distally with 2 rows of large modified chaetae ( Fig. 59D); mucro proximal tooth larger than distal one, basal spine reaching the proximal tooth ( Fig. 59D).

Description. Total length (head + trunk) of specimens 1.59–2.60 mm (n=4), holotype 2.32 mm. Specimens pale yellowish or whitish with dark blue or violet pigments weakly distributed over the distal half, proximal and distal regions of the Ant III–II; Ant I–Th II depigment; Th III–Abd III with a transverse band heavily pigmented; coxa III and trochanter III strongly pigmented; collophore and Abd IV–Abd VI always depigmented; eyepatches black ( Figs 54A–B).

arrows indicate elongated sens, ventral apically acuminate mac and dorsal apically foot-shaped mac; B, clypeal and prelabral chaetotaxy; C, head chaetotaxy (left side).

Head. Antenna smaller than the trunk length ( Fig. 54A), ratio antennae: trunk = holotype 0.65: 1; antennal ratio as I: II: = 1: 1.03–1.53 (n=4), holotype 1: 1.47: 1.41: 2.03. Ant IV weakly annulated on its distal 3/4 and devoid of apical bulb, with at least 4 apical finger-shaped sens and numerous sens of different sizes. Ant III sense organ with 2 finger-shaped sens, 3 guard sens, 4 elongated sens and at least 6 finger-shaped sens. Ant II dorsally with about 6 elongated sens and 5 mac; ventrally with 5 apically acuminate mac ( Fig. 55A). Ant I dorsally with 2 elongated sens, 9 mac and 4 smooth mic at the base ( Fig. 55A). Eyes A and B larger, G and H slighlty smaller than the others, with 6 interocular chaetae ( q, v, s, p, r, t), p as mac; head dorsal chaetotaxy ( Fig. 55C) with 9–11 ‘ An ’, 3 ‘ A ’, 4–5 ‘ M ’, 9 ‘ S ’, 1–2 ‘ Ps ’, 4 ‘ Pa ’, 2 ‘ Pi ’, 2 ‘ Pm ’, 1–2 ‘ Pmp ’, 5 ‘ Pp1 ’, 1 ‘ Ppe ’ and 5 ‘ Pe ’ mac (2 extra mac between the series), respectively. Clypeal formula with 4 ( l1–2), 17–21 ( f, 1 unpaired), 5 ( pf0–2) ciliate chaetae, l1–2 longer and apically acuminate, 2 f and pf0–1 larger than the others, others subequal ( Fig. 55B). Labral inner papillae with 3–4 equal or unequal projections, outer papillae with 2 subequal projections and smaller than the inner papillae ( Fig. 56A). Prelabral chaetae smooth, pl1 equally or subequally bifurcated, pl2 unequally bifurcated ( Fig. 55B). Labial papilla E l.p. conical-shaped and not reaching the base of a.a.; e6 appendix absent ( Fig. 56B). Maxillary palp b.c. 1.03 longer than t.a.; sublobal plate with 3 inner appendages ( sb1–3). Basolateral and basomedian labial fields with M1–2, R, E, L1–2 ciliate, M2 and R smaller than the others, M2 present or absent. Cephalic groove with 10–11 ciliate chaetae of different sizes; postlabial formula with 4 ( G1–4), 3 ( X2, X, X 4), 4 ( H1–4) chaetae plus 3 chaetae between the series ( Fig. 56C).

Thorax chaetotaxy ( Fig. 57A). Th II a, m and p series (excluding the anterior collar) with 8, 5–6 and 18–20 mac, respectively. Th III a, m and p series with 7, 4–5 and 10–13 mac, respectively. Ratio Th II: III = 1.79–1.53: 1 (n=4), holotype 1.79: 1.

Abdomen chaetotaxy ( Figs 57B–C). Abd I a, m and p series with 2, 5–8 and 1 mac, respectively. Abd II a, m and p series with 1–2, 5 and 1–2 mac, respectively. Abd III a, m and p series with 1, 3 and 2 mac, respectively and 4 extra mac or mes laterally. Abd IV with 21–23 inner mac of A–C series and 17–22 outer mac of T–Fe series; about 12 sens ( as and ps type I and others type II) and 23 posterior mes. Abd V a, m, p and pp series with 4, 3, 3, and 1 mac, respectively. Ratio Abd III: IV = 1: 7.32–9.19 (n=4), holotype 1: 9.00.

Legs ( Figs 58A–E). Subcoxa I with 3–4 chaetae and 2 psp; subcoxa II with an anterior row of 11 chaetae and about 25 anterior chaetae; posterior row of 6 chaetae, 2 anterior chaetae, 1 posterior chaeta and 4 psp; subcoxa III with one row of 9 chaetae, about 31 anterior chaetae, 1 posterior chaeta and 2 psp ( Figs 58A–C). Trochanteral organ with 48 spine-like chaetae, 5 anterior, 6 posterior, 30 internal, 1 apical and 6 on the distal arm ( Fig. 58D). Tibiotarsus I–III with 7 inner finely ciliate mac; 1 outer apically acuminate mac at the base. Unguis b.t. on proximal 1/2, m.t. on distal 2/4 and larger than b.t., a.t. minute and on distal 1/7. Unguiculus I–III lamellae ( ae, ai, pe, pi) smooth and acuminate, except unguiculus III pe with 3 proximal teeth (partially serrated); ratio unguis: unguiculus = 1: 0.46. Tibiotarsus III smooth chaeta 1.14 longer than the unguiculus; tenent hair 0.87 smaller than the unguis ( Fig. 58E).

Collophore ( Fig. 59A). Anterior side with about 77–78 ciliate chaetae, 4 distal mac and about 73–74 chaetae of different sizes widely distributed on the corpus; posterior side with about 177 ciliate chaetae of different sizes widely distributed on the corpus (13 unpaired) and distally with 1 smooth chaeta; lateral flap with 12–22 smooth chaetae, without ciliate chaetae.

Furcula ( Figs 59B–D). Manubrium ventrally with 2 subapical and about 60 distal ciliate chaetae of different sizes ( Fig. 59B). Manubrial plate dorsally with 9–11 chaetae of different sizes and 3 psp ( Fig. 59C). Dens dental lobe with 2 ( bs1 and bs2) thicker ciliate chaetae, bs1 subequal to bs2. Dens tightly crenulate on its distal one 1/8 distally with 2 rows (1 inner and 1 outer) of large modified chaetae, 1 inner chaeta distally larger than others. Mucro proximal tooth larger than distal one, mucronal spine almost reaching the proximal tooth apex ( Fig. 59D).

Distribution. Known only from type locality, Rondônia state, Cacaulândia municipality, Brazil ( Fig. 72).

Etymology. The name “ elizeuli ” (in apposition) refers to Elizeul Viana Santos, father of the first author of the species.

Remarks. Entomobrya elizeuli sp. nov. resembles E. inaequalis Denis, 1924 from Paraná state ( Brazil), E. wasmanni Handschin, 1924 from Santa Catarina state ( Brazil), and E. uambae by the presence of a transversal band on trunk and mucro proximal tooth larger than distal the distal one ( Arlé 1959; Bonet 1933; Christiansen 1963; Denis, 1924; Handschin 1924). However, E. elizeuli sp. nov. differs from these species by a dark transversal band on Th III to Abd III ( Figs 54A–B), present on Th III to Abd I in E. inaequalis and E. wasmanni , while E. uambae has a dark transversal band exclusively on Abd IV ( Figs 29A–L). Entomobrya elizeuli sp. nov. also differs by Ant IV apical bulb absent (bilobed in E. inaequalis and E. wasmanni ), labral inner papillae with 3–4 projections ( Fig. 56A), (conical in E. inaequalis and E. wasmanni , with 2 projections in E. uambae ), unguiculus III ai lamella acuminate ( Fig. 58E) (slightly truncate in E. wasmanni and E. uambae ), unguiculus III pe lamella partially serrated ( Fig. 58E) (smooth in the others) and mucronal spine almost reaching the proximal tooth ( Fig. 59D) (reaching in the others). The new species also differs from E. uambae by head macrochaetotaxy ( Fig. 55C), with ‘ An ’ series with 9–11 mac ( 7–9 in E. uambae ) and Ps5, Pp4 and Pe6 mac present (absent in E. uambae ). On the trunk E. elizeuli sp. nov. differs by Abd IV ( Fig 57C) with 17–22 outer mac (12–16 outer in E. uambae ), and 23 posterior mes ( 16 in E. uambae ). Other differences between these species are summarized in Table 2.